Hi,
I started my CH up last weekend and all the rads upstairs heated up fully, but downstairs remanded cold. I tried bleeding all the rads, but no air in any of them. I then tried turning the upstairs rads off to see if the heat would come through downstairs. Eventually, the downstairs rads warmed, but only luke warm at best. I can hear the pump, and if I touch the flow or return pipes I can feel what I assume is the pump working. BTW Flow pipe is red hot and return is luke warm unless I feel the return right next to the pump where it is red hot also, but a few inches further away it soon cools. Also the flow pipes into the rads which heat fully are hot, but return pipes are hardy warm at all.
I'm thinking it is sludge so have added some X400 and plan to flush (manually, not power) the rads at the weekend. However, things seem to be getting worse! I have had system running constantly for a few days (to push the X400 around), now rads which had heated up only get luke warm, even upstairs. Downstairs is always cold even if I turn the upstairs rads off. Can sludge do this or is the pump on its way out and just not up to pumping the whole system anymore? Also would the X400 have goto into the rads which remained cold?
Now some details; I have a Baxi Combi 105e and the CH worked fine last year. I did have a drip fixed on the boiler a month ago, I think the engineer replaced the diaphragm on the flow switch. Most of the rads have a TRV, which I fitted a year ago, but I have loosened the collars so they are really loose. If you need more info let me know.
It would be great if anyone could guide me if they think it is sludge or the pump, or is it something else?
Thanks in advance.
Martin
I started my CH up last weekend and all the rads upstairs heated up fully, but downstairs remanded cold. I tried bleeding all the rads, but no air in any of them. I then tried turning the upstairs rads off to see if the heat would come through downstairs. Eventually, the downstairs rads warmed, but only luke warm at best. I can hear the pump, and if I touch the flow or return pipes I can feel what I assume is the pump working. BTW Flow pipe is red hot and return is luke warm unless I feel the return right next to the pump where it is red hot also, but a few inches further away it soon cools. Also the flow pipes into the rads which heat fully are hot, but return pipes are hardy warm at all.
I'm thinking it is sludge so have added some X400 and plan to flush (manually, not power) the rads at the weekend. However, things seem to be getting worse! I have had system running constantly for a few days (to push the X400 around), now rads which had heated up only get luke warm, even upstairs. Downstairs is always cold even if I turn the upstairs rads off. Can sludge do this or is the pump on its way out and just not up to pumping the whole system anymore? Also would the X400 have goto into the rads which remained cold?
Now some details; I have a Baxi Combi 105e and the CH worked fine last year. I did have a drip fixed on the boiler a month ago, I think the engineer replaced the diaphragm on the flow switch. Most of the rads have a TRV, which I fitted a year ago, but I have loosened the collars so they are really loose. If you need more info let me know.
It would be great if anyone could guide me if they think it is sludge or the pump, or is it something else?
Thanks in advance.
Martin